Speed of Sound and Ideal-Gas Heat Capacity at Constant Pressure of Gaseous Difluoromethane

1997 ◽  
Vol 42 (4) ◽  
pp. 795-799 ◽  
Author(s):  
Li-Qun Sun ◽  
Yuan-Yuan Duan ◽  
Lin Shi ◽  
Ming-Shan Zhu ◽  
Li-Zhong Han
Keyword(s):  
Heat Capacity ◽  
Speed Of Sound ◽  
Constant Pressure ◽  
Ideal Gas

Speed of sound and ideal-gas heat capacity at constant pressure of gaseous trifluoroiodomethane (CF3I)

1997 ◽  
Vol 137 (1-2) ◽  
pp. 121-131 ◽  
Author(s):  
Y.Y. Duan ◽  
L.Q. Sun ◽  
L. Shi ◽  
M.S. Zhu ◽  
L.Z. Han
Keyword(s):  
Heat Capacity ◽  
Speed Of Sound ◽  
Constant Pressure ◽  
Ideal Gas

FALSIFICATIONS OF POISSON ADIABATE, HUGONIO ADIABATE, LAPLACE SOUND SPEEDS. MODERNIZATION OF FOUNDATIONS OF THERMODYNAMICS

2020 ◽  
Vol 5 (333) ◽  
pp. 58-67
Author(s):  
K.B. Jakupov ◽  
Keyword(s):  
Shock Wave ◽  
Heat Capacity ◽  
Specific Heat ◽  
Specific Heat Capacity ◽  
Speed Of Sound ◽  
Constant Pressure ◽  
Energy Balance Equation ◽  
Ideal Gas ◽  
Constant Volume ◽  
Capacity Coefficient

The inequality of the universal gas constant of the difference in the heat capacity of a gas at constant pressure with the heat capacity of a gas at a constant volume is proved. The falsifications of using the heat capacity of a gas at constant pressure, false enthalpy, Poisson adiabat, Laplace sound speed, Hugoniot adiabat, based on the use of the false equality of the universal gas constant difference in the heat capacity of a gas at constant pressure with the heat capacity of a gas at a constant volume, have been established. The dependence of pressure on temperature in an adiabatic gas with heat capacity at constant volume has been established. On the basis of the heat capacity of a gas at a constant volume, new formulas are derived: the adiabats of an ideal gas, the speed of sound, and the adiabats on a shock wave. The variability of pressure in the field of gravity is proved and it is indicated that the use of the specific coefficient of ideal gas at constant pressure in gas-dynamic formulas is pointless. It is shown that the false “basic formula of thermodynamics” implies the falseness of the equation with the specific heat capacity at constant pressure. New formulas are given for the adiabat of an ideal gas, adiabat on a shock wave, and the speed of sound, which, in principle, do not contain the coefficient of the specific heat capacity of a gas at constant pressure. It is shown that the well-known equation of heat conductivity with the gas heat capacity coefficient at constant pressure contradicts the basic energy balance equation with the gas heat capacity coefficient at constant volume.

Speed of sound, ideal-gas heat capacity at constant pressure, and second virial coefficients of HFC-227ea

2001 ◽  
Vol 178 (1-2) ◽  
pp. 73-85 ◽  
Author(s):  
Chang Zhang ◽  
Yuan-Yuan Duan ◽  
Lin Shi ◽  
Ming-Shan Zhu ◽  
Li-Zhong Han
Keyword(s):  
Heat Capacity ◽  
Speed Of Sound ◽  
Constant Pressure ◽  
Virial Coefficients ◽  
Ideal Gas ◽  
Second Virial Coefficients

Ideal Gas Heat Capacity Derived from Speed of Sound Measurements in the Gaseous Phase for trans-1,3,3,3-Tetrafluoropropene

2013 ◽  
Vol 58 (11) ◽  
pp. 2966-2969 ◽  
Author(s):  
Yuya Kano ◽  
Yohei Kayukawa ◽  
Kenichi Fujii ◽  
Haruki Sato
Keyword(s):  
Heat Capacity ◽  
Gaseous Phase ◽  
Speed Of Sound ◽  
Ideal Gas

Speed-of-Sound Measurements and Ideal-Gas Heat Capacity for 1,1,1,2-Tetrafluoroethane and Difluoromethane

1996 ◽  
Vol 41 (5) ◽  
pp. 1187-1190 ◽  
Author(s):  
Tsutomu Hozumi ◽  
Haruki Sato ◽  
Koichi Watanabe
Keyword(s):  
Heat Capacity ◽  
Speed Of Sound ◽  
Ideal Gas

Speed of sound and ideal-gas heat capacity of freon R-236ea

2008 ◽  
Vol 15 (3) ◽  
pp. 369-371 ◽  
Author(s):  
S. G. Komarov ◽  
V. A. Gruzdev ◽  
S. V. Stankus
Keyword(s):  
Heat Capacity ◽  
Speed Of Sound ◽  
Ideal Gas

A modified Kardos equation for the thermal conductivity of refrigerants

2018 ◽  
Vol 17 (02) ◽  
pp. 1850012 ◽  
Author(s):  
Giovanni Di Nicola ◽  
Gianluca Coccia ◽  
Sebastiano Tomassetti
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Molar Volume ◽  
Speed Of Sound ◽  
Constant Pressure ◽  
Average Distance ◽  
Critical Density ◽  
Radius Of Gyration ◽  
Liquid Heat ◽  
Thermal Conductivities

This work presents a modification of the Kardos equation specifically oriented to refrigerants. The proposed equation was tested for both liquid and vapor thermal conductivities along saturation of the main refrigerants. In the Kardos equation, the thermal conductivity of liquids is a function of the density of the liquid, heat capacity at constant pressure, speed of sound in the liquid and average distance between the centers of the molecules. In the present version, the liquid molar volume and the distance between the surfaces of adjacent molecules were replaced by two constant parameters widely available for all the fluids: the critical density and radius of gyration. In this way, the resulting equation is much simpler, still being a scaled equation. In the proposed equations, an adimensional factor was regressed to minimize the deviations. The final equations were able to predict the thermal conductivity with AAD[Formula: see text] for liquids and AAD[Formula: see text] for vapors.

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